Return-Path: Delivered-To: apmail-tomcat-users-archive@www.apache.org Received: (qmail 13268 invoked from network); 26 Jul 2007 20:23:34 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 26 Jul 2007 20:23:34 -0000 Received: (qmail 17497 invoked by uid 500); 26 Jul 2007 20:23:23 -0000 Delivered-To: apmail-tomcat-users-archive@tomcat.apache.org Received: (qmail 17478 invoked by uid 500); 26 Jul 2007 20:23:23 -0000 Mailing-List: contact users-help@tomcat.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: "Tomcat Users List" Delivered-To: mailing list users@tomcat.apache.org Received: (qmail 17467 invoked by uid 99); 26 Jul 2007 20:23:23 -0000 Received: from herse.apache.org (HELO herse.apache.org) (140.211.11.133) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 26 Jul 2007 13:23:23 -0700 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests= X-Spam-Check-By: apache.org Received-SPF: pass (herse.apache.org: local policy) Received: from [192.61.61.104] (HELO usea-naimss2.unisys.com) (192.61.61.104) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 26 Jul 2007 13:23:20 -0700 Received: from usea-nagw1.na.uis.unisys.com ([129.224.72.16]) by usea-naimss2 with InterScan Message Security Suite; Thu, 26 Jul 2007 15:22:59 -0500 Received: from usea-nagw1.na.uis.unisys.com ([129.224.72.51]) by usea-nagw1.na.uis.unisys.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 15:22:57 -0500 Received: from USRV-EXCH4.na.uis.unisys.com ([192.61.245.232]) by usea-nagw1.na.uis.unisys.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 26 Jul 2007 15:22:57 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Subject: RE: Tomcat with 8 GB memory Date: Thu, 26 Jul 2007 15:22:57 -0500 Message-ID: In-Reply-To: <11817605.post@talk.nabble.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Tomcat with 8 GB memory Thread-Index: AcfPvKFAu6080pr/S3Gnn8U+Zy8f2wABU6Pg References: <11804198.post@talk.nabble.com> <46A8ECAA.7090407@christopherschultz.net> <11817605.post@talk.nabble.com> From: "Caldarale, Charles R" To: "Tomcat Users List" X-OriginalArrivalTime: 26 Jul 2007 20:22:57.0682 (UTC) FILETIME=[C14A3720:01C7CFC2] X-Virus-Checked: Checked by ClamAV on apache.org > From: lightbulb432 [mailto:veerukrishnan@hotmail.com]=20 > Subject: Re: Tomcat with 8 GB memory >=20 > The last is at the following link, several performance=20 > graphs for Linux show a slight or sharp decrease in=20 > performance for a given Tomcat instance beyond a certain > number of users! Why is this? > http://www.webperformanceinc.com/library/reports/windows_vs_linux_part1/ index.html Read the text, don't just look at the pictures: "In the next part of this report, we will find that tuning the JVM memory parameters resolve the performance slump that we saw in this round of testing" They overloaded a toy machine (512 MB - get serious) and saw GC issues. Nothing to do with Tomcat, just with overrunning their setup. Running multiple instances of Tomcat (or any other Java application) means you have _less_ aggregate heap memory available than for a single instance. I suspect running with JRE 6 would avoid the slump even without tweaking the heap settings, but I don't have time to verify that. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org For additional commands, e-mail: users-help@tomcat.apache.org